The wait is finally over. After months of spy shots, spy shots, and more spy shots, the 2014 Chevrolet Silverado and GMC Sierra made its official world debut this morning ahead of its scheduled unveiling at the 2013 North American International Auto Show next month. While we've seen both variants of General Motors' full-size trucks wrapped in camouflage, not much was known about either model, until now.

As expected, the third-generation Chevrolet Silverado and GMC Sierra feature three all-new engines: a 4.3-liter V-6, a 5.3-liter V-8, and a 6.2-liter V-8, all of which are part of a pod known as "EcoTec 3." The displacements are still the same on the aforementioned mills but each features new technologies like direct injection, variable valve timing, and cylinder deactivation. Each engine is mated to a six-speed automatic transmission, and while General Motors won't go into fuel economy specifics until closer to the trucks entering the market, the use of cylinder deactivation is expected to boost overall fuel figures. For those wondering, yes, the V-6 will also be knocked down two cylinders when the deactivation function kicks in. This is good news for truck fans though as the ever increasing and strict Corporate Average Fuel Economy (CAFE) standards have been a thorn in the side of light-duty truck engineers everywhere. Besides fuel economy specifics, GM is also mum on the output of both the V-6 and V-8 engines but every important number to a truck owner is expected to see a bump with the 2014 Chevrolet Silverado and GMC Sierra. As for the all-new 4.3-liter V-6 engine, it has also been reintroduced to keep pace with Ford's EcoBoost engine. The smaller mill is also mated to a six-speed automatic transmission but official power numbers are still anyone's guess for the time being. While GM hasn't come out and said it, rumors are pointing to the discontinuation of both the Silverado and Sierra hybrid models for the third-generation as well.

Besides the new engines, the 2014 Chevrolet Silverado and GMC Sierra feature new body paneling that's lighter and friendlier to fuel efficiency figures than previous models. According to Mark Reuss, GM President of North America, the Silverado and Sierra will be more fuel efficient than the models each replaces thanks to a combination of new engine configurations and a much bigger focus on aerodynamics. Official EPA fuel figures haven't been released yet but we expect the General promises to reveal those at the 2014 Chevrolet Silverado and GMC Sierra's unveil at the Detroit auto show next month. Like the previous-gen Silverado and Sierra, the boxy front-end and gaping grille are back for the third-gen models. The front-end has also been sealed up tight to only allow air in to cool the engine and nothing more. GM says each model is "more differentiated than ever before" and the body paneling was sculpted for optimal aerodynamics.Inside, the 2014 Chevrolet Silverado and GMC Sierra both received some much-needed attention. GM's goal "is to be the quietest, most refined pickup in the segment" and added inlaid doors that fit into the body along with a windshield that's been raked even more to deflect wind noise will help. Below the redesigned center stack, a row of auxiliary buttons await orders like adjusting the pedals, turning traction control on or off, a switch for a bed light, forward collision alert, and lane departure warning. The shape of each switch is similar to those found in the Ford Super Duty. Perhaps the one part that needed to be swapped out the most inside the previous-gen Silverado and Sierra was the thin steering wheel that looked awkward and out of place to say the least. The 2014 Chevrolet Silverado and GMC Sierra's steering wheel is similar to that seen in the 2014 Chevrolet Impala and more importantly, it feels like it deserves to be there. As for the center console, it will have little issue swallowing up necessary goods for field work like a tablet or laptop. At the top of the center console rests either a 4.2-inch or a 8-inch touchscreen infotainment system that either has Chevrolet's MyLink or GMC's Intellilink operating systems. A pair of cup holders take up space on top of the center console and can easily fit that obscenely big coffee thermos you have in the back of the cabinet.If you're one for USB ports then Chevrolet and GMC have a truck for you. Underneath the center stack, there are two 12 volt outlets, a 110 outlet, and three USB ports. On the sidewall of the cavernous center console rests another couple of USB ports as well. Needless to say, you won't have much of an issue running anything and everything from each of these trucks. Heated cloth seats are also available for the first time ever in a pickup truck. On the Sierra, LED lighting hide underneath the rail lamps in the bed as a standard feature and it's also available on the Silverado. There are also four tie-down hooks that can withstand 500 pounds of whatever you can wrap around them. An EZ lift and lower tailgate is also standard.The 2014 Chevrolet Silverado and GMC Sierra will bow again next month at the 2013 North American International Auto Show. Both full-size trucks are expected to hit dealership showroom floors later this year.Curious to see the whole unveil for yourself? GM has posted it on YouTube for all to enjoy. So sit back, relax, and watch all 24 minutes for yourself.[UPDATE: We've gotten a considerable amount of pictures from the show floor. Enjoy all 141 pictures in our gallery.]

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